TWI804365B - Display panel module and display device - Google Patents

Abstract

A display panel module including an upper display panel and a lower display panel is provided. The lower display panel and the upper display panel are stacked and the lower display panel includes a substrate, a light control layer and a light converging layer. The light control layer includes a plurality of light absorbing elements. The light converging layer includes a plurality of light converging elements. The light converging layer is disposed between the light control layer and the upper display panel. The light control layer is disposed between the substrate and the light converging layer. A vertical projection of these light absorbing elements on the substrate falls within a vertical projection of these light converging elements on the substrate. A display device is also provided.

Description

Display panel module and display device

The invention relates to a display panel module and a display device.

Display technology continues to develop toward thinner, lighter, and higher-contrast targets. In some displays, the dark state is made darker by adjusting the backlight module to improve contrast. Or, in some displays, contrast is improved by forming a display with dual display panels. However, since the spatial frequencies of the pixels of the upper and lower display panels are similar, and the upper and lower display panels may be misaligned when they are assembled, light interference occurs between the upper and lower display panels, forming Moire patterns and greatly reducing display quality.

The present invention provides a display panel module and a display device, comprising an upper display panel and a lower display panel, which can avoid or reduce the formation of moiré fringes.

According to an embodiment of the present invention, a display panel module is provided, including an upper display panel and a lower display panel. The lower display panel and the upper display panel are arranged in layers and The lower display panel includes a substrate, a light control layer, and a light concentrating layer. The light control layer includes a plurality of light absorption elements arranged in an array in the light control layer. The light concentrating layer includes a plurality of light concentrating elements arranged in an array in the light concentrating layer, the light concentrating layer is arranged between the light control layer and the upper display panel, and the light control layer is arranged between the substrate and the light concentrating layer between. The vertical projection of the light absorbing elements on the substrate falls within the vertical projection of the light concentrating elements on the substrate.

According to an embodiment of the present invention, a display device is provided, including the above-mentioned display panel module and a backlight module, the backlight module is stacked with the upper display panel and the lower display panel, wherein the lower display panel is arranged on the upper display panel and the backlight module between groups.

Based on the above, the display panel module and the display device provided by the embodiments of the present invention use the light-gathering layer to shift the light of the backlight module, so that part of the backlight can be emitted from the top of the light-absorbing element (black matrix), reducing the lower display panel. The brightness difference between the middle black matrix area and the light-transmitting pixel area further reduces the degree of light interference between the upper and lower display panels, and avoids or reduces moiré fringes caused by the alignment shift of the upper and lower display panels.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

1: Display device

10: Backlight module

10L: light

100: Lower display panel

110, 310: light control layer

200: upper display panel

AL: active layer

BM1~BM3: light absorbing element

BF: buffer layer

CL1~CL3: pixel control layer

CFL: color resist layer

CF1~CF3: color resistance

DE: drain

DL: data line

GE: Gate

GL: scan line

H1, H2: through hole

LC: liquid crystal molecules

LC1, LC2: liquid crystal layer

ITO1, ITO2: transparent conductive layer

ILD: interlayer insulating layer

PL: passivation layer

P1~P3: polarizing layer

PE: pixel electrode

SE: source

SM: Masked metal

S1~S4: Substrate

TFT1, TFT2: switching elements

TL: transparent color resist

VL: Concentrating element

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the invention.

FIG. 2 is a partial plan view of the lower display panel in FIG. 1 .

FIG. 3 is a schematic partial cross-sectional view of the lower display panel in FIG. 1 .

FIG. 4 is a schematic partial cross-sectional view of a lower display panel according to an embodiment of the invention.

FIG. 5 is a partially enlarged view of FIG. 4 .

Referring to FIG. 1 , it shows a schematic cross-sectional view of a display device according to an embodiment of the present invention. The display device 1 includes a backlight module 10 , a lower display panel 100 and an upper display panel 200 . The lower display panel 100 is disposed between the backlight module 10 and the upper display panel 200 . The light beams emitted from the backlight module 10 pass through the lower display panel 100 and the upper display panel 200 in sequence.

The upper display panel 200 includes a polarizing layer P2 , a substrate S3 , a pixel control layer CL2 , a liquid crystal layer LC2 , a transparent conductive layer ITO2 , a color resist layer CFL, a substrate S4 , and a polarizing layer P3 stacked sequentially from bottom to top.

The pixel control layer CL2 includes a plurality of scan lines and a plurality of data lines (not shown) arranged in an array, and also includes switching elements TFT2 and pixel electrodes (not shown) corresponding to the pixels of the upper display panel 200 . Each switching element TFT2 is configured to control the voltage difference between the pixel electrode and the common electrode of the corresponding pixel to control the direction of the corresponding liquid crystal molecules LC in the liquid crystal layer LC2 to determine the light transmittance of each pixel.

The color resist layer CFL includes a plurality of color resists, and the plurality of pixels of the upper display panel 200 Corresponding to different color resistances (color resistances CF1~CF3 shown in Figure 1) respectively, to display predetermined colors. In an embodiment, the color resistance CF1 may be a red color resistance, the color resistance CF2 may be a green color resistance, and the color resistance CF3 may be a blue color resistance, but the invention is not limited thereto. By controlling the light transmittance of each pixel and matching the color of the color resist corresponding to each pixel, the purpose of displaying image information is achieved. It should be noted that the upper display panel 200 also includes a plurality of light-absorbing elements BM2 arranged in an array, corresponding to a plurality of switching elements TFT2 and boundary configurations between a plurality of pixels, such as scanning lines and data lines, to block unnecessary light, Increase contrast. In one embodiment, the light absorbing element BM2 is a black color resist.

Also referring to FIG. 1 , the lower display panel 100 includes a polarizing layer P1 , a substrate S1 , a pixel control layer CL1 , a liquid crystal layer LC1 , a transparent conductive layer ITO1 , and a substrate S2 which are sequentially stacked. The lower display panel 100 is not configured with colored color resists, while the upper display panel 200 is configured with colored color resists CF1 - CF3 . This is because the image information of the display device 1 is provided by the upper display panel 200 , and the lower display panel 100 is used to improve the contrast of the display device 1 .

The lower display panel 100 also includes a light management layer 110 and a light collecting layer. The light control layer 110 includes a plurality of light absorption elements BM1, and these light absorption elements BM1 are arranged in the light control layer 110 in an array. In one embodiment, the light absorbing element BM1 is a black color resist, but the invention is not limited thereto. The light-gathering layer includes a plurality of light-gathering elements VL, and these light-gathering elements VL are arranged in the light-gathering layer in an array. Moreover, the light concentrating layer is disposed between the light control layer 110 and the upper display panel 200 , and the light control layer 110 is disposed between the substrate S1 and the light concentrating layer.

Next, please refer to FIG. 1 and FIG. 2 at the same time. FIG. 2 shows a partial plan view of the lower display panel in FIG. 1 . As shown in FIG. 2 , the pixel control layer CL1 includes a plurality of scanning lines GL and a plurality of data lines DL arranged in an array, and also includes switching elements TFT1 corresponding to a plurality of pixels of the lower display panel 100 .

It should be noted that although the light control layer 110 in FIG. 1 is not shown in FIG. The data line DL and a plurality of switching elements TFT1 are arranged to block unnecessary light. In other words, the light-absorbing element BM1 is arranged between the scanning line GL shown in FIG. 2 and the light-condensing element VL arranged above it, and the light-absorbing element is arranged between the data line DL and the light-condensing element VL arranged above it. BM1, a light absorbing element BM1 is also disposed between the switching element TFT1 and the light concentrating element VL disposed above it.

The width of the light absorbing element BM1 may be equal to or greater than the corresponding widths of the scanning line GL, the data line DL and the switching element TFT1. However, the present invention is not limited thereto, and the width of BM1 may also be smaller than the widths of the corresponding scan line GL, data line DL and switching element TFT1.

The light concentrating elements VL arranged on the light absorbing elements BM1 have a larger width than the light absorbing elements BM1. In an embodiment of the present invention, the width of the light concentrating element VL is larger than that of the corresponding scanning line GL, and the vertical projection of the scanning line GL on the substrate S1 falls within the vertical projection of the light concentrating element VL on the substrate S1. However, the present invention is not limited thereto. In one embodiment, the vertical projection of the scan line GL on the substrate S1 overlaps the vertical projection of the light concentrating element VL on the substrate S1 .

In an embodiment of the present invention, the width of the light concentrating element VL is greater than that of the corresponding data line DL, and the vertical projection of the data line DL on the substrate S1 falls within the vertical projection of the light concentrating element VL on the substrate S1. However, the present invention is not limited thereto. In one embodiment, the vertical projection of the data line DL on the substrate S1 overlaps the vertical projection of the light concentrating element VL on the substrate S1 .

In the embodiment shown in FIG. 1 , the vertical projection of the light-absorbing element BM1 on the substrate S1 will fall into the vertical projection of the corresponding light-condensing element VL on the substrate S1, which enables the light 10L from the backlight module 10 to Penetrates the light collecting element VL. Moreover, the condensing element VL has a profile like a plano-convex lens in the sectional view of FIG. 1 , and has the function of converging light. Therefore, the light 10L passing through the light concentrating element VL changes its traveling direction and exits the light concentrating element VL from above the light absorbing element BM1 , as shown in FIG. 1 . In such a case, the brightness difference between the region where the light absorbing element BM1 is arranged and the light-transmitting pixel region in the lower display panel 100 is reduced, thereby reducing the degree of light interference between the upper display panel 200 and the lower display panel 100 , to avoid or reduce the moiré fringes generated by the misalignment of the upper display panel 200 and the lower display panel 100 .

Referring to FIG. 3 , it shows a schematic partial cross-sectional view of the lower display panel in FIG. 1 . The pixel control layer CL1 of the lower display panel 100 includes a switching element TFT1 and a pixel electrode PE, and the switching element TFT1 includes an active layer AL, a gate GE, a source SE and a drain DE, wherein a An interlayer insulating layer ILD is disposed between the gate insulating layer GI, the source SE, and the drain DE and the gate GE. The shielding metal SM corresponding to the active layer AL is disposed on the substrate S1, and the shielding metal SM and A buffer layer BF is arranged between the active layers AL.

A passivation layer PL is disposed on the source SE and the drain DE, and the switching element TFT1 is disposed between the substrate S1 and the passivation layer PL. The passivation layer PL is disposed between the switching element TFT1 and the light absorbing element BM1. The pixel electrode PE is electrically connected to the switching element TFT1 through the through hole H1 of the passivation layer PL.

The vertical projection of the light absorbing element BM1 on the substrate S1 falls within the vertical projection of the light concentrating element VL on the substrate S1. In an embodiment of the present invention, the light-condensing element VL disposed above the switching element TFT1 is a convex lens or a Fresnel lens, and the diameter of the light-condensing element VL is greater than or equal to the width of the light-absorbing element BM1.

In order to fully illustrate various implementation aspects of the present invention, other embodiments of the present invention will be described below. It must be noted here that the following embodiments use the component numbers and part of the content of the previous embodiments, wherein the same numbers are used to denote the same or similar components, and descriptions of the same technical content are omitted. For the description of omitted parts, reference may be made to the foregoing embodiments, and the following embodiments will not be repeated.

Referring to FIG. 4 and FIG. 5 , FIG. 4 is a schematic partial cross-sectional view of a lower display panel according to an embodiment of the present invention, and FIG. 5 is a partial enlarged view of FIG. 4 . The lower display panel shown in FIG. 4 is the same as the lower display panel 100 shown in FIG. 1 to FIG. A plurality of light absorbing elements BM3 are configured, and the light concentrating layer has a plurality of light concentrating elements VL arranged in an array, and the vertical projection of the light absorbing element BM3 on the substrate S1 falls on the vertical projection of the light concentrating element VL on the substrate S1 middle. The lower display panel shown in FIG. 4 is different from the lower display panel 100 in that the light control layer 310 also has The transparent color resist TL disposed between the light absorbing elements BM3 is prepared, and the vertical projection of the light concentrating element VL on the substrate S1 partially overlaps the vertical projection of the transparent color resist TL on the substrate S1. Referring to FIG. 5 , the transparent color resist TL has a through hole H2 , the switching element TFT1 is disposed between the substrate S1 and the light control layer 310 , and is connected to the pixel electrode PE through the through hole H2 .

To sum up, the display panel module and the display device provided by the embodiments of the present invention use the light-gathering layer to shift the light of the backlight module, so that part of the backlight can be emitted from the top of the light-absorbing element (black matrix), reducing the The difference in brightness between the black matrix area and the light-transmitting pixel area in the display panel further reduces the degree of light interference between the upper and lower display panels, and avoids or reduces moiré fringes caused by the alignment shift of the upper and lower display panels.

1: Display device

10: Backlight module

10L: light

100: Lower display panel

110: light control layer

200: upper display panel

BM1~BM2: light absorbing element

CL1~CL2: pixel control layer

CFL: color resist layer

CF1~CF3: color resistance

LC: liquid crystal molecules

LC1, LC2: liquid crystal layer

ITO1, ITO2: transparent conductive layer

P1~P3: polarizing layer

S1~S4: Substrate

TFT2: switching element

VL: Concentrating element

Claims (9)

A display panel module, comprising: upper display panel; and The lower display panel is stacked with the upper display panel, and the lower display panel includes: Substrate; A light control layer comprising a plurality of light absorbing elements arranged in an array in the light control layer; and The light-gathering layer includes a plurality of light-gathering elements arranged in an array in the light-gathering layer, and the light-gathering layer is arranged between the light control layer and the upper display panel , and the light control layer is disposed between the substrate and the light concentrating layer, Wherein the vertical projection of the plurality of light absorbing elements on the substrate falls within the vertical projection of the plurality of light concentrating elements on the substrate. The display panel module according to claim 1, wherein the lower display panel further includes a plurality of scan lines arranged between the substrate and the light-concentrating layer, and the plurality of scan lines are on the substrate The vertical projection on the substrate overlaps the vertical projections of the plurality of light concentrating elements on the substrate. The display panel module according to claim 1, wherein the lower display panel further includes a plurality of data lines arranged between the substrate and the light-concentrating layer, and the plurality of data lines are on the substrate The vertical projection on the substrate overlaps the vertical projections of the plurality of light concentrating elements on the substrate. The display panel module as claimed in claim 1, wherein the plurality of light absorbing elements are black color resists. The display panel module according to claim 1, wherein the light control layer further includes a plurality of transparent color resists arranged between the plurality of light absorbing elements, and the plurality of light concentrating elements are on the substrate The vertical projection on the substrate partially overlaps the vertical projection of the plurality of transparent color resists on the substrate. The display panel module according to claim 5, wherein the lower display panel further includes a switching element and a pixel electrode, at least one of the plurality of transparent color resistors has a through hole, and the switching element is arranged on the between the substrate and the light control layer, and connected to the pixel electrode through the through hole. The display panel module according to claim 1, wherein the plurality of light concentrating elements are convex lenses or Fresnel lenses, and the diameter of the plurality of light concentrating elements is greater than or equal to the width of the plurality of light absorbing elements. The display panel module according to claim 1, wherein the lower display panel further includes a switch element, a pixel electrode, and a passivation layer, the switch element is arranged between the substrate and the passivation layer, and the passivation layer It is disposed between the switching element and at least one of the plurality of light absorbing elements, and the pixel electrode is connected to the switching element through a through hole in the passivation layer. A display device comprising: The display panel module as described in any one of claims 1 to 8; and A backlight module is stacked with the upper display panel and the lower display panel, wherein the lower display panel is arranged between the upper display panel and the backlight module.

Images